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-rw-r--r--include/linux/cred.h50
1 files changed, 50 insertions, 0 deletions
diff --git a/include/linux/cred.h b/include/linux/cred.h
new file mode 100644
index 000000000000..b69222cc1fd2
--- /dev/null
+++ b/include/linux/cred.h
@@ -0,0 +1,50 @@
1/* Credentials management
2 *
3 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12#ifndef _LINUX_CRED_H
13#define _LINUX_CRED_H
14
15#define get_current_user() (get_uid(current->user))
16
17#define task_uid(task) ((task)->uid)
18#define task_gid(task) ((task)->gid)
19#define task_euid(task) ((task)->euid)
20#define task_egid(task) ((task)->egid)
21
22#define current_uid() (current->uid)
23#define current_gid() (current->gid)
24#define current_euid() (current->euid)
25#define current_egid() (current->egid)
26#define current_suid() (current->suid)
27#define current_sgid() (current->sgid)
28#define current_fsuid() (current->fsuid)
29#define current_fsgid() (current->fsgid)
30#define current_cap() (current->cap_effective)
31
32#define current_uid_gid(_uid, _gid) \
33do { \
34 *(_uid) = current->uid; \
35 *(_gid) = current->gid; \
36} while(0)
37
38#define current_euid_egid(_uid, _gid) \
39do { \
40 *(_uid) = current->euid; \
41 *(_gid) = current->egid; \
42} while(0)
43
44#define current_fsuid_fsgid(_uid, _gid) \
45do { \
46 *(_uid) = current->fsuid; \
47 *(_gid) = current->fsgid; \
48} while(0)
49
50#endif /* _LINUX_CRED_H */
get: remove struct tt_internal' href='/cgit/cgit.cgi/litmus-rt-ext-res.git/commit/drivers/md/dm-target.c?id=45194e4f89fbdd97a2b7d2698c05f0b00c19e820'>45194e4f89fb
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/*
 * Copyright (C) 2001 Sistina Software (UK) Limited
 *
 * This file is released under the GPL.
 */

#include "dm.h"

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/bio.h>

#define DM_MSG_PREFIX "target"

static LIST_HEAD(_targets);
static DECLARE_RWSEM(_lock);

#define DM_MOD_NAME_SIZE 32

static inline struct target_type *__find_target_type(const char *name)
{
	struct target_type *tt;

	list_for_each_entry(tt, &_targets, list)
		if (!strcmp(name, tt->name))
			return tt;

	return NULL;
}

static struct target_type *get_target_type(const char *name)
{
	struct target_type *tt;

	down_read(&_lock);

	tt = __find_target_type(name);
	if (tt && !try_module_get(tt->module))
		tt = NULL;

	up_read(&_lock);
	return tt;
}

static void load_module(const char *name)
{
	request_module("dm-%s", name);
}

struct target_type *dm_get_target_type(const char *name)
{
	struct target_type *tt = get_target_type(name);

	if (!tt) {
		load_module(name);
		tt = get_target_type(name);
	}

	return tt;
}

void dm_put_target_type(struct target_type *tt)
{
	down_read(&_lock);
	module_put(tt->module);
	up_read(&_lock);
}

int dm_target_iterate(void (*iter_func)(struct target_type *tt,
					void *param), void *param)
{
	struct target_type *tt;

	down_read(&_lock);
	list_for_each_entry(tt, &_targets, list)
		iter_func(tt, param);
	up_read(&_lock);

	return 0;
}

int dm_register_target(struct target_type *tt)
{
	int rv = 0;

	down_write(&_lock);
	if (__find_target_type(tt->name))
		rv = -EEXIST;
	else
		list_add(&tt->list, &_targets);

	up_write(&_lock);
	return rv;
}

void dm_unregister_target(struct target_type *tt)
{
	down_write(&_lock);
	if (!__find_target_type(tt->name)) {
		DMCRIT("Unregistering unrecognised target: %s", tt->name);
		BUG();
	}

	list_del(&tt->list);

	up_write(&_lock);
}

/*
 * io-err: always fails an io, useful for bringing
 * up LVs that have holes in them.
 */
static int io_err_ctr(struct dm_target *tt, unsigned int argc, char **args)
{
	/*
	 * Return error for discards instead of -EOPNOTSUPP
	 */
	tt->num_discard_bios = 1;

	return 0;
}

static void io_err_dtr(struct dm_target *tt)
{
	/* empty */
}

static int io_err_map(struct dm_target *tt, struct bio *bio)
{
	return -EIO;
}

static int io_err_map_rq(struct dm_target *ti, struct request *clone,
			 union map_info *map_context)
{
	return -EIO;
}

static struct target_type error_target = {
	.name = "error",
	.version = {1, 2, 0},
	.ctr  = io_err_ctr,
	.dtr  = io_err_dtr,
	.map  = io_err_map,
	.map_rq = io_err_map_rq,
};

int __init dm_target_init(void)
{
	return dm_register_target(&error_target);
}

void dm_target_exit(void)
{
	dm_unregister_target(&error_target);
}

EXPORT_SYMBOL(dm_register_target);
EXPORT_SYMBOL(dm_unregister_target);